you should upgrade for 2 reasons:
1. it'll fix the SEQ_OS error (you need to go to at least 1.5.1 or higher)
2. go to at least 5.1.x to support vCenter 5.1/ESXi 5.1
you should upgrade for 2 reasons:
1. it'll fix the SEQ_OS error (you need to go to at least 1.5.1 or higher)
2. go to at least 5.1.x to support vCenter 5.1/ESXi 5.1